Using 128 threads by default for cuda kernels #599
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Resolves #526
This shaves off a bit of time during forward & backward pass by allowing cuda to split operations across multiple groups.
Shaves off a millisecond from
conv2dbench, and when benchmarking with https://github.com/coreylowman/image-classification on batch size 64, the forward time goes from approximately 36ms -> 28ms, and backward from 60ms -> 51ms